The Weller XNTK 0054486099, Chisel Solder Tip, features a 1.2mm x .4mm Tip Diameter, solid copper plated with iron all over, and nickel and chromium behind the working surface. The 0054486099 is designed to provide maximum heat transfer from the heater to the tip and is individually bagged. Meant for use with the WXP65 Iron.